migrating from LE/VSE-conforming languages

353

C for VSE/ESA

353

 

 

 

 

 

 

COBOL for VSE/ESA

354

 

 

 

 

PL/I for VSE/ESA

354

 

 

 

 

 

 

migrating from non-LE/VSE run-time

 

 

 

environments

354

 

 

 

 

 

 

 

C/370

355

 

 

 

 

 

 

 

 

DOS PL/I

356

 

 

 

 

 

 

 

DOS/VS COBOL

356

 

 

 

 

 

 

migrating Assembler applications

359

 

 

migrating interlanguage communications

 

 

applications

358

 

 

 

 

 

 

options mapping

354

 

 

 

 

 

 

VS COBOL II

355

 

 

 

 

 

 

VS FORTRAN

358

 

 

 

 

 

 

migrating from VSE/ICCF to MVS and TSO/E

 

163

converting ICCF libraries

163

 

 

 

ICCF procedures and macros

167

 

 

 

migrating TCP/IP

193

 

 

 

 

 

 

bibliography

197

 

 

 

 

 

 

 

network definitions 194

 

 

 

 

 

security

 

196

 

 

 

 

 

 

 

 

TCP/IP batch jobs

195

 

 

 

 

 

TCP/IP configuration

 

 

 

 

 

 

TCP/IP customization

195

 

 

 

 

TCP/IP standard applications 195

 

 

TCP/IP related user data

195

 

 

 

user written TCP/IP applications

 

 

 

CGI programs

196

 

 

 

 

 

using the BSD/C Sockets

196

 

 

 

using the LE/VSE C Socket API

196

 

 

using the Preprocessor API

196

 

 

using the Sockets API for Assembler

196

migration

 

 

 

 

 

 

 

 

 

 

assignments

44

 

 

 

 

 

 

 

benefits customer migration

532

 

 

 

cost elements

39

 

 

 

 

 

 

customer background

529

 

 

 

 

customer environment

 

529

 

 

 

 

device

36

 

 

 

 

 

 

 

 

duration customer migration

531

 

 

 

effort for AFP

235

 

 

 

 

 

 

file 35

 

 

 

 

 

 

 

 

 

 

file copy

35

 

 

 

 

 

 

 

 

from LE/VSE

359

 

 

 

 

 

 

 

from LE/VSE-conforming languages

353

 

 

from non-LE/VSE run-time environments

354

functional reasons

10

 

 

 

 

 

in-place

 

35

 

 

 

 

 

 

 

 

interlanguage communications applications

358

kernel approach

27

 

 

 

 

 

 

mass application approach 28

 

 

 

MQSeries

205

 

 

 

 

 

 

 

object code 251

 

 

 

 

 

 

 

performance customer migration

531

 

 

plan - guide and outline

42

 

 

 

 

prepare environment

401

 

 

 

 

print applications

241

 

 

 

 

 

migration (continued)

 

 

 

 

 

 

project objectives

13

 

 

 

 

 

reasons

3, 4, 10

 

 

 

 

 

 

 

responsibilities

43

 

 

 

 

 

 

REXX issues

371

 

 

 

 

 

 

sizing

 

18

 

 

 

 

 

 

 

 

 

SNA network

485

 

 

 

 

 

 

support material

134

 

 

 

 

 

task summary

182

 

 

 

 

 

 

TCP/IP

193

 

 

 

 

 

 

 

 

test systems

420

 

 

 

 

 

 

traditional reasons

4

 

 

 

 

 

VM/ESA guest support

 

29

 

 

 

VSE RPG II to OS/390

329

 

 

 

VSE to OS/390 considerations

250, 352

VSE/ICCF to MVS TSO/E

163

 

 

why

3

 

 

 

 

 

 

 

 

 

 

milestone events

48

 

 

 

 

 

 

miscellaneous functions

99

 

 

 

mismatches of file attributes

258

 

 

MPF 22, 25

 

 

 

 

 

 

 

 

 

MPS for DL/I

178

 

 

 

 

 

 

 

MQPUTIL program

204

 

 

 

 

 

MQSeries

197

 

 

 

 

 

 

 

 

bibliography

206

 

 

 

 

 

 

defining MQSeries object & operating

203

in your operating system environment

198

migration

205

 

 

 

 

 

 

 

MQSeries based applications

205

 

MQSeries in operating system environment

CICS considerations

 

201

 

 

data sets

202

 

 

 

 

 

 

installation & customization

200

 

prerequisites

198

 

 

 

 

 

networking definitions

203

 

 

 

object

 

203

 

 

 

 

 

 

 

 

operating

203

 

 

 

 

 

 

 

MTC statement

83

 

 

 

 

 

 

 

multi-protocol communication subsystem

188

multiple

 

 

 

 

 

 

 

 

 

 

 

3270 sessions

429

 

 

 

 

 

 

file clause

255

 

 

 

 

 

 

 

instream data set input

 

74

 

 

 

search/feedback

325

 

 

 

 

 

string processing

128

 

 

 

 

 

system support

212

 

 

 

 

 

Multiple Region Operation (MRO)

136

 

multitasking

334

 

 

 

 

 

 

 

multitasking macros

283

 

 

 

 

 

MVCOM

277

 

 

 

 

 

 

 

 

 

MVS

 

 

 

 

 

 

 

 

 

 

 

BCP customization

415

 

 

 

 

CICS management modules

142

 

commands

450

 

 

 

 

 

 

 

compiler specific options

336

 

 

component terminology

21

 

 

conditional JCL

84

 

 

 

 

 

 

data management macros

292

 

Index 607

Page 631
Image 631
IBM OS/390 manual 356, VS Fortran, Migration, Tcp/Ip

OS/390 specifications

IBM OS/390, a versatile operating system, was a cornerstone in enterprise environments and played a pivotal role in mainframe computing. Released in the mid-1990s, OS/390 combined the strengths of IBM's MVS (Multiple Virtual Storage) with new features and enhancements, targeting scalability, reliability, and performance in demanding business applications.

One of the key features of OS/390 was its robust support for multiple users and processes. The system allowed thousands of concurrent users to access applications and data, ensuring high availability and minimizing downtime—a critical requirement for many large organizations. This scalability was supported through various enhancements in memory management and processor scheduling, enabling optimal resource allocation across diverse workloads.

OS/390 was known for its superior workload management capabilities. The Workload Manager (WLM) component allowed administrators to define service policies, specifying how system resources would be allocated according to the priority of tasks. This ensured that critical business processes received the necessary resources while less critical tasks were managed more flexibly.

Another significant characteristic of OS/390 was its commitment to security. The operating system provided comprehensive security features, including user authentication, data encryption, and auditing capabilities. This focus on security was vital for organizations handling sensitive data, ensuring compliance with regulations and safeguarding against unauthorized access.

OS/390 also supported advanced technologies that facilitated integration and development. The system included features like the IBM CICS (Customer Information Control System) for transaction processing and IMS (Information Management System) for database management. These technologies allowed organizations to build robust, high-performance applications tailored to specific business needs.

The ease of network integration was another strength of OS/390. With the advent of the Internet and global connectivity, OS/390 systems could easily interface with various network protocols, enabling businesses to operate in a connected world. This inclusion paved the way for many organizations to expand their capabilities and offer new services, driving digital transformation.

In conclusion, IBM OS/390 represented a significant advancement in mainframe technology, combining scalability, security, and robust workload management. Its rich feature set and support for critical enterprise applications solidified its role as a vital component of many organizations' IT infrastructures, ensuring they could meet their operational challenges head-on while supporting future growth. As technology continues to evolve, the legacy of OS/390 remains influential in the realm of computing.